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Why is vitamin K important if I take warfarin?

ANSWER

Warfarin is also something called a vitamin K antagonist. That means it stops your liver from turning vitamin K into substances that normally help clot your blood.

Warfarin won't work as well if you suddenly add more foods or supplements with vitamin K to your diet. Your blood might clot when it doesn't need to.

On the other hand, if you stop taking in vitamin K altogether, your dose of warfarin may become too strong.

SOURCES:

Cleveland Clinic: “Pulmonary Embolism.”

Heart and Stroke Foundation of Canada: “Anticoagulants.”

Journal of Pharmacy Practice : “A Comprehensive Review of Potential Warfarin-Fruit Interactions.”

National Blood Clot Alliance: “Vitamin K and Coumadin -- What You Need To Know.”

UpToDate: “Patient education: Warfarin (Coumadin) (Beyond the Basics).”

Mayo Clinic: "Prothrombin time test," "Warfarin diet: What foods should I avoid?"

UW Health: "Coumadin and Warfarin Diet Interactions."

Harvard Health Publishing: "Should you consider taking a fish oil supplement?"

Reviewed by Jennifer Robinson on March 27, 2020

SOURCES:

Cleveland Clinic: “Pulmonary Embolism.”

Heart and Stroke Foundation of Canada: “Anticoagulants.”

Journal of Pharmacy Practice : “A Comprehensive Review of Potential Warfarin-Fruit Interactions.”

National Blood Clot Alliance: “Vitamin K and Coumadin -- What You Need To Know.”

UpToDate: “Patient education: Warfarin (Coumadin) (Beyond the Basics).”

Mayo Clinic: "Prothrombin time test," "Warfarin diet: What foods should I avoid?"

UW Health: "Coumadin and Warfarin Diet Interactions."

Harvard Health Publishing: "Should you consider taking a fish oil supplement?"

Reviewed by Jennifer Robinson on March 27, 2020

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Which foods are high in vitamin K?

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